Method of forming concrete walls



' Nov. 1, 1938. -w. A. JENNINGS METHOD OF FORMING CONCRETE WALLS Filed ma 29, 1936 Zwemor Patented Nov. 1, 1938 METHOD OF FORMING CONCRETE WALLS William Allen Jennings, Des Moines, Iowa, assignor to Economy Forms Corporation, Des Moines,

Iowa,

1 Claim.

a corporation of Iowa 7 Application May 29, 1936, Serial No.

is done in my improved method, it will remain in plastic condition, and it is also characterized I then so constructed that for temporarily supporting a layer of heat in- 5 the walls by contraction or expansion, due to sulating material Hi. In some instances I emchanges in temperature, will not be transmitted ploy as the heat insulating material the well to the other wall to thereby reduce the probabilknown product mineral wool, and this is applied ity of cracking due to such expansion and conby simply pressing it against the sticky or ad- 10 traction. hesive moistureproofing material. I have also 10 A further object is to provide a method of employed wall boards made of corn stalks or constructing my improved wall at a minimum of the like, and this also is supported in position by expense for labor and material. the sticky or adhesive moistureproofing material In the accompanying drawing Figure 1 shows I then preferably apply another coating of the a sectional view of a single concrete wall with same moistureproofing material to the opposite 15 two metal forms on its sides. side of the 1nsulating material I then replace Figure 2 shows a similar View with one of the the form structure previously removed by simply metal forms removed and the spreader bar supmounting it upon the projecting spreader bars ported in the concrete. which are extended through openings in the Figure 3showsa sectional view of the completform and then securely locked against move- 20 ed double monolithic wall with the moisturement by the pins l3 extended through the outer proofing and insulating material applied and one of the holes Hi. This is done after the first with the metal forms on the outer surfaces of wall has set and hardened and the form is sethe walls. curely held in place by the spreader bars and pins 35 Figure 4 shows a view similar to Figure 3 with so that it is not necessary to use braces for supthe forms removed; and l porting the form at this time.

Figure 5 shows a view of the completed wall Then the second concrete wall is poured in with a wooden wall supported by the concrete the space between the first wall and the replaced wall. form.

39 In the construction of my improved wall I After the second wall isset and hardened I repreferably employ sheet metal mould forms of move the spreader bars. These are straight and the kind now in commlon use and which have uniform in size throughout and can easily be thus smooth sheet metal body portions l0 braced withdrawn. I find that in practice when these and reinforced by outwardly extended flanges spreader bars are removed before the removal of H, which flanges are plOVlded with holes I2 to the forms, their removal does not cause the con recelve pins 13, and I also employ spreader bars crete surrounding the spreader bars to ch1p ofi M to extend through openings formed in both to any appreciable extent. When the spreader of the forms and provided with two openings [5 bars are removed, the form sections are also reat one end through which the pins l3 may be exmoved, and after such removal the openings in ende the concrete wall from the outer side are filled 40 I'practice my improved method as follows: I with moistureproofing material l9, and I preferfirst erect the two forms in spaced apart position ably fill the openings at the inner side of the wall and, as is customary, each form structure is suitwith wooden plugs 20 which I have found to be ably braced and supported to hold it in position convenient for nailing wooden strips 2| to the Then in the space between the forms the first concrete wall so that a wooden wall 22 could be concrete wall is erected in the ordinary manner supported against the concrete wall when desired. This wall is indicated as I6 I then remove the I also preferably employ tie wires 23 prefermould forms from one side of the concrete wall ably made of somewhat flexible metal, one end after the wall has set and hardened This leaves of which is inserted through the mould form be- 0 the spreader bars l4 projecting out through the fore the first concrete Wall is poured, and then found that a great deal of labor and material is saved because, after the first wall has set and hardened, the forms may be very quickly and easily replaced in position and supported by the spreader bars which are firmly fixed in the first concrete wall, so that the material and labor necessary to brace and support the replaced forms can be saved. a

I have also found that with my improved double monolithic concrete wall the cracking of the walls due to expansion and contraction by temperature changes is almost wholly eliminated because, with the moistureproofing material in plastic condition one wall may be moved slightly in the manner in which it is moved by contraction or expansion without imparting a corresponding motion to the other wall, because the plastic moistureproofing page of one wall relative to the other.

I claim as my invention:

The method of constructing upright concrete material permits slipwalls, which consists in providing two upright mould forms, supporting said mould forms in spaced apart pos'tions by spacing bars extended through and beyond one of the mould forms, then filling the space between the mould forms and permitting it to set and harden and thereby firmly hold the spacing bars in position, then removing the mould form through which the spacing bars are extended, then applying a layer of compressible material to the exposed concrete surface, then replacing the mould form upon the spacing bars in spaced apart position from the compressible material and utilizing the previously formed concrete wall in firmly holding the spacing bars and supporting the replaced mould form, then fillingv the space between the compressible material and the replaced mould form with the concrete and removing the mould forms and spacing bars.

WILLIAM ALLEN JENNINGS. 

